Answer: Photosynthesis and cellular respiration are complementary biochemical reactions.
Explanation:
Photosynthesis requires the products of respiration , while respiration requires the products of photosynthesis.
(i) The investigation was carried out at 40°C because the temperature is near optimum temperature and it denatures at a higher temperature.
(ii) The effects of increasing the pH on rate of activity of enzyme Q will be the increase in activity from pH 3 to pH 7, the decrease in activity from pH 7 to pH 11 and the optimum pH.